Tool for use in retrieving an essentially cylindrical object from a well bore

Abstract

There are disclosed two embodiments of a tool for use in retrieving a cylindrical object which is stuck within a well bore, or, in the event the object cannot be retrieved, releasing therefrom to permit recovery of the tool.

What is claimed is: 
     
       1. A tool for use in retrieving an essentially cylindrical object in a well bore, comprising; a hollow body adapted to be connected to a well string for vertical and rotary movement therewith within the well bore and having a bowl about its inner surface,   a circumferentially expandable and contractible grapple having an outer surface supported on an inner surface on the bowl for movement between an upper expanded position to fit over the object to support it therefrom, and   a seal ring mounted on the inner side of the bowl at one end of the grapple so as to sealably engage about the object when it is supported by the grapple,   said seal ring having an inner cylindrical surface sized to fit closely about the object and an annular, upwardly and inwardly facing lip above the cylindrical surface in position to be deformed into sealing engagement with the object and thus form a barrier to the circulation of fluid downwardly between the bowl and object.   
     
     
       2. As in claim 1, wherein the seal ring is mounted on the body beneath the grapple.   
     
     
       3. As in claim 2, wherein the grapple is a basket slidable over the bowl, and   the seal ring is supported on a central ring mounted within the body which holds the grapple and bowl against relative rotation.   
     
     
       4. As in claim 1, wherein the seal ring is mounted on the body above the grapple.   
     
     
       5. As in claim 4, wherein the grapple is a coil slidable over the bowl, and there is a central ring mounted in the body beneath the grapple which holds the grapple and bowl against relative rotation.